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Stock Award Plans and Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2026
Stock Award Plans and Stock-Based Compensation [Abstract]  
Schedule of Stock Options Granted

See below for a summary of the stock options granted under the 2011, 2017 and 2018 plans:

 

       Weighted   Weighted   Aggregate 
       Average   Average   Intrinsic 
   Number of   Exercise   Remaining   Value 
   Options   Price   Life (Years)   (in millions) 
Outstanding at January 1, 2026   15,941,550   $2.80    9.8   $
 
Granted   2,709,865   $1.66           
Forfeitures   (430,133)  $16.21           
Outstanding at March 31, 2026   18,221,282   $2.31    9.5   $5.7 
Exercisable at March 31, 2026   8,930,436   $2.62    9.2   $2.4 
Schedule of Fair Values of Options Awarded

The following assumptions were used in estimating the fair values of options awarded during the three months ended March 31, 2026:

 

   Three Months
Ended
March 31,
2026
Fair value of common stock  $1.43 - $1.92
Exercise price  $1.43 - $1.92
Expected term  5.0 – 5.8 years
Volatility  134.52% - 149.33%
Risk-free interest rate  3.51% - 3.95%
Dividend yield 
—%
Schedule of Stock-Based Compensation Charges

Stock-based compensation charges for the periods indicated below (in thousands) are as follows:

 

   Three Months Ended
March 31,
 
   2026   2025 
Research and development  $205   $162 
Sales and marketing   382    16 
General and administrative   4,260    277 
Total  $4,847   $455